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CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]            
Dividends on Common Shares (in dollars per share) $ 0.5675 $ 0.5675 $ 0.5675 $ 0.535 $ 0.535 $ 0.535
Issuance of Common Shares, par value (in dollars per share) $ 5 $ 5 $ 5